code: def fill_queue(
      grpc_input_generator: Iterator[ray_client_pb2.DataRequest],
      output_queue: "Queue[Union[ray_client_pb2.DataRequest, ray_client_pb2.DataResponse]]",  # noqa: E501
  ) -> None:
      """
      Pushes incoming requests to a shared output_queue.
      """
      try:
          for req in grpc_input_generator:
              output_queue.put(req)
      except grpc.RpcError as e:
          logger.debug(
              "closing dataservicer reader thread "
              f"grpc error reading request_iterator: {e}"
          )
      finally:
          # Set the sentinel value for the output_queue
          output_queue.put(None)
  
imports: from collections import defaultdict
  from ray.util.client.server.server_pickler import loads_from_client
  import ray
  import logging
  import grpc
  from queue import Queue
  import sys
  from typing import Any, Dict, Iterator, TYPE_CHECKING, Union
  from threading import Event, Lock, Thread
  import time
  import ray.core.generated.ray_client_pb2
  import ray.core.generated.ray_client_pb2_grpc
  from ray.util.client.common import CLIENT_SERVER_MAX_THREADS, _propagate_error_in_context, OrderedResponseCache
  from ray.util.client import CURRENT_PROTOCOL_VERSION
  from ray.util.debug import log_once
  from ray._private.client_mode_hook import disable_client_hook
label_desc: Use image node_id 3 for calling a global function with example usage: fill_queue(grpc_input_generator, output_queue) without return types